Emmision designator of MP-73n SSTV mode

This seems to be the central (and unanswered) question as to whether FCC-licensed Amateurs can legally use MP-73n SSTV mode on the 30m band. I have done a lot of searching on the net, with no results. No one can agree on what the emission designator for this mode is.

I would like to see the ARRL technical staff become involved in finding what the emmission designator for this mode is, so that there can be a definitive answer to the question of whether FCC-licensed Amateurs can legally use MP-73n SSTV mode on the 30m band.

I have seen far too much contradictory information on the net as to whether U.S. Amaterus can legally use MP-73n on 30m. We need to know the emission designator of this mode so we can have a definitive answer!